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Cultural Ferment

Thobwa Recipe: Malawi’s Sweet-Sour Fermented Maize Drink

By Updated 2 min read

Thobwa is the sweet-sour fermented maize drink at the heart of Malawian food culture — served at funerals, weddings, and sold in plastic bags by street vendors across the country. Here’s everything you need to know about making it at home.

At a glance

Thobwa is a non-alcoholic fermented drink from Malawi. Maize porridge is cooled to about 45°C, mixed with ground malted grain (in central Malawi, malted maize), left overnight to sweeten and sour, then boiled, giving a light-brown, thick, sweet-sour drink that all ages drink. Brewing reduced aflatoxin by about two-thirds in a study but didn't remove it, so it must be made from clean, mould-free grain.

  • Non-alcoholic Malawian drink of maize porridge and ground malt.
  • Malt added at about 45°C; the mixture ferments overnight (about 17 hours).
  • Traditionally boiled after fermenting, so it has no live cultures.
  • Brewing cut aflatoxin to about 36% of the starting level – it can't fix mouldy grain.
  • Drunk by all ages, including children and infants, in Malawi.

Ferment profile

Origin
Malawi
Fermentation
Lactic acid
Main microbes
Spontaneous: bacteria and yeasts from the malt and surroundings
Live cultures
No (cooked, baked or pasteurized)
Alcohol
None / trace

Thobwa is a traditional fermented, non-alcoholic drink from Malawi, made from cooked grain and malted grain. In central Malawi it’s mainly made from ground maize and malted maize, and the result is a light-brown, fairly thick, opaque drink with a sweet-and-sour taste. It’s popular across the country and drunk by everyone, children and infants included (Namaumbo et al., 2023). It belongs to the same family as Tanzania’s togwa and South Africa’s maheu.

How Thobwa Is Made

When researchers asked experienced Malawian thobwa brewers to make a standardised batch, the steps were (Namaumbo et al., 2023):

  1. Cook a porridge of maize flour and water (4.5 kg of flour to 15 litres) for 80 minutes.
  2. Cool it to about 45°C and stir in ground malt, at about a third of the weight of the maize flour.
  3. Leave the mixture overnight to ferment – about 17 hours.
  4. Boil the fermented thobwa (40 minutes in the study) and let it cool.

The malt does two jobs. Its enzymes break the porridge’s starch into sugars, which thin the porridge and make it sweet; the bacteria and yeasts it brings, along with those from the pot and the air, sour it overnight. The final boil stops the fermentation and kills the microbes, so traditionally made thobwa is a fermented drink but not a source of live cultures.

Aflatoxin: Start With Clean Grain

Maize and malted maize are both prone to moulds that produce aflatoxins, which are classed as human carcinogens (IARC group 1), and malting – damp grain sprouting for days – raises the risk. In central Malawi, some households keep low-grade, shrivelled maize for brewing, and aflatoxin levels of up to 1,020 µg/kg have been reported in Malawian malted maize. When thobwa was brewed from contaminated maize and malt, fermentation removed about 20% of the aflatoxin and boiling about a third; after a day the drink still held about 36% of the starting amount (16–66 µg/kg), and the level then stayed the same for eight days (Namaumbo et al., 2023).

So brewing reduces aflatoxin but can’t make mouldy grain safe – which matters for a drink given to infants. Use clean, whole, mould-free maize meal and malt, sprout your own malt only from sound grain, and throw away any malt that turns mouldy or smells musty. The same rule applies to African opaque beers such as busaa.

Serving

Stir thobwa before serving – the solids settle – and drink it cool or at room temperature. For a thinner drink, add water. For another soured maize food, see Nigerian ogi.

Recipe: Thobwa

Makes
About 1.2 litres
Hands-on
75 min
Fermentation
About 17 hours (overnight)
Temperature
Warm room temperature, about 25–30°C
Difficulty
Easy

Equipment

  • Heavy pot
  • Whisk or wooden spoon
  • Thermometer
  • Bowl or pot with a cloth cover

Ingredients

  • 300 g white maize meal (fresh, from a reliable source)
  • 1 litre water (plus extra for thinning)
  • 100 g ground malt (maize malt (or sorghum or millet malt); barley malt works but adds gluten)
  • To taste sugar (optional)

Method

  1. Whisk the maize meal into 250 ml of the water, then stir it into the remaining 750 ml at a boil. Cook gently, stirring often, for 40–80 minutes (longer is traditional), adding a little water if it gets too stiff.
  2. Take it off the heat and let it cool to about 45°C.
  3. Stir in the ground malt thoroughly. Within about half an hour the porridge should start to thin and taste sweeter.
  4. Cover with a cloth and leave in a warm place overnight, about 17 hours, until it smells pleasantly sour.
  5. Bring it back to the boil and simmer for 10–40 minutes, stirring, then cool. Thin with water to taste and sweeten if you like.
  6. Keep it covered in the fridge and drink within 2–3 days.
  7. Use only clean, mould-free maize and malt, and discard a batch that smells rotten or grows mould.

Frequently asked questions

What is thobwa?

A traditional non-alcoholic fermented drink from Malawi, made from maize porridge and ground malt, soured overnight and boiled.

Is thobwa alcoholic?

No – it's described as a non-alcoholic beverage and is drunk by all ages in Malawi.

Is thobwa probiotic?

Traditionally made thobwa is boiled after fermenting, which kills the microbes, so it isn't a source of live cultures.

What malt is used for thobwa?

Grain that has been sprouted, dried and ground. In central Malawi it's mainly malted maize; thobwa is also made from other grains and their malts.

What's the difference between thobwa and togwa?

Both are sweet-sour fermented cereal drinks made with malt; togwa is Tanzanian and thobwa Malawian, and traditional thobwa is boiled after fermenting.

Is there aflatoxin in thobwa?

There can be if the maize or malt was mouldy. Brewing reduced it to about a third in a study, so start with clean grain.

Sources

  1. Namaumbo S et al. (2023). Reduction of aflatoxins during brewing of a Malawian maize-based non-alcoholic beverage, thobwa. Food Sci Nutr 11(6):2864–2871. Link
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